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The following circuit diagrams the temperature controlled pulse-width modulator (PWM) boost converter which allows operation of a 12V brushless DC fan from a +5V supply.
ZXSC400 is a voltage mode boost converter that can be used in white LED backlighting for LCD, general LED backlighting, LED flashlights or general LED driving from batteries. The following schematic diagram shows you how the ZXSC400 driving a Luxeon® V Star LED, a high powered LED. And we provide you also the datasheet of this device from the Zetex Semiconductors.
Driving the LEDs can be in parallel and/or series connections. It has both their own advantages and disadvantages. A weakness of the parallel connection method is that LED current and brightness do not automatically match. White LEDs are popular portable equipment LCD backlights used for such portable equipment like PDAs, cellphones, and digital cameras. A boost converter (charge-pump, inductor-based), is needed since the battery voltage of most handheld devices is too low for either method.
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